Waterproof cement.



Examiner. u

UNITED STATES PATENT OFFlGE.

MELVILLE MILLINGTON SMITH, OF FREDON IA, KANSAS, ASSIGNOR TO THE FREDON IA PORT- LAND OEMENT COMPANY, OF FREDONIA, KANSAS, A CORPORATION OF NEW JERSEY.

\ WATERPROOF CEMENT.

Specification 01' Letters Patent.

Application filed September 9, 1908.

Patented April 13, 1909.

Serial No. 452,182.

To all whom it may concern:

Be it known that I, MELVILLE MILLING- TON SMITH, a citizen of the United States, and a resident of Fredonia, in the county of Wilson and State of Kansas, have made certain new and useful Improvements in Viaterproof Cement, of which the following is a specification.

,My invention relates to an improved process for the manufacture of white waterproof cement of a kind suitable for the making of articles of stone, or for other uses where a white waterproof cement is desirable.

The object of my invention is to provide a method by which an ordinary cement composed of varying proportions of SiO,, A1 0 and CaO, can be whitened and waterproofed after being burned to a clinker.

The use of the above ingredients for the making of cement is common, but the addition of a mixture for whitening andnfatg proofing the ordinary white cement, as out- 'etl'iii the following process, is, as I believe, new.

My invention consists in c mpjg in rotary (ir in uprigliit '1 s, andinlgimlate mixture 0 imestone re-c a an ac in or a mixtureof Hines one an feldspathic clay, the materials being practically free of iron. The burning is continued almost up to thevpojnt offueiog, that is to say, be- 1yj ond the smtering limit. The mixture is to e made according to the proportions xSiO,+'yAl,O,=CaO, in which x=2.5 to 2.7 and 'y 1 to 1.1. The combination of the SiO,,1Al,O,' and CaO is brought about by 'of SiO,, A1 0,, and CaO, to form white Portlan'd cement.

m the mass has been well calcined, the

clinker therefrom is treated with the followmg mixture, to wit: a 40 to 80% SiO and a 20 to 40 A1 0,, the latter beameably in the fofrTcZfkaolin. The mixture of the clinker afd'the SiO, and the A1 0 is then passed through the finishing mills, such as tube mills, Gnfiin mills, Kent mills, &c., and thorou hly round to ether. This mixture of the SiO z 3 1 the clinker has the effect of whitening the resulting finely ground product, and gives it waterproofing qualities of a lasting character.

The herein described process of making white waterproof cement, which consists in the admixture of lime and clay as free as possible from iron, together with a flux,

urning the resulting mass to the verge of fusion, that is to say, beyond the sintering limit, and grinding the resulting clinker with a mixture of clay free from iron.

HELTILLE MILLINGTGN SMITH. 

